Patents by Inventor Henry K. Walters, Jr.

Henry K. Walters, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Partial purification of wet-process phosphoric acid with acetone and ammonia
    Patent number: 4152402
    Abstract: An improved process for the purification of wet-process phosphoric acid (WPPA) with acetone and ammonia. The main product is the purified acid and a byproduct is the impure acid fraction in a liquid form containing most of the impurities including the added ammonia. The WPPA is mixed with acetone and the specified amount of ammonia to form two liquid phases that separate rapidly. The top layer contains about 75 percent of the phosphoric acid, nearly all the acetone, and a small fraction of the impurities. The bottom liquid layer has a viscosity usually in the range of 40 to 2500 centipoises, depending on the acid concentration and the amount of ammonia used. The acetone is distilled from the two liquid phases for recycle to the process.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: May 1, 1979
    Assignee: Tennessee Valley Authority
    Inventors: Henry K. Walters, Jr., Yong K. Kim, John D. Hatfield